voltage offset + 0.3 for 4690k 4.5 ghz?

[malific-end]

I have my cpu at 4.5 ghz, 1.213 volts, seemingly stable on prime and games with an auto offset of +0.3v can someone tell me what the offset actually does ? and what is / isnt "safe"?

 

[andy_Man]

It means your voltage will scale if you are allowing your cpu to scale. For example, my cpu will clock itself down to 1600Mhz because I allow it in the bios and in windows power options. When it scales itself down to 1600Mhz it only uses around 1.0 volt. However, because of my offset being .3** (I forget exactly) when it clocks itself up to 4.7Ghz my voltage goes up to 1.35(if my memory serves me)

 

[Shneiky]

There is a thing called VID. Basically, your motherboard knows that your CPU needs 0.8 vCore for 1.6 Ghz, 1 for 2.4 Ghz; 1.15 for 3.5 Ghz (some examples, don't really remember the stock options for Haswell). That is what Intel has hardcoded as a VID and the motherboard reads it and applies the voltage.

If you apply an offset - that means you are changing the behavior of the voltage application. So if you have offset of +0.3 that means the motherboard will take the VID and a do a simple math - VID + Offset + Additional Turbo boost Voltage Load Line Calibration level = final vCore.

In my 2700k OC I have an offset of -0.135 and additional turbo voltage at +0.065. So when I am running at 3.5 GHz (no Turbo) I get:

vCore = VID + Offset + Additional Turbo + Load Line Calibration level

vCore = 1.25 + (-0.135) + 0 / vCore = 1.15

When I run at at 4.2 Ghz I have:

vCore = 1.25 + (-0.135) + 0.065 / vCore = 1.18

And then, because I use Load Line Calibration level 2 I get a final of 1.19.

Your 1.21 vCore seems perfectly fine for a Haswell chip.

 

[malific-end]

So when im running at 4.5 ghz are you saying that my 1.21 + +0.3 would equal a final of 1.51v? because this is what im fearing, running games at 4.5ghz 1.51 volt, however CPUID shows vcore never above 1.21 even at 4.5ghz full load?
and also the frequency scales down, for instance if i boot to desktop and i move my mouse around then the cpu frequency climbs up and voltage hits 1.212, if i stop it drops down to lower frequencies (800) and the volts drop to 0.781, does this seem right?

Also my 4th core tends to idle and load around 5 degrees higher than my second core, 1st 30 2nd 28 3rd 30 and 4th 33, could this be thermal paste issue or is core split temps like this common?

 

[andy_Man]

I always just cpuid to check out voltage under load. It looks like your base is probably .9 with a .3 offset. Do you have c states enabled in motherboard and your windows power settings setup so your cpu can scale down?
IF yes, what is your voltage at idle.

I might be thinking speedstep not c states.

 

[Shneiky]

malific-end,

No. 1.213 is not your base VID. 1.10 or 1.15 is the base VID for Haswell under turbo (seen people report anywhere in those lines).

Depending on your LLC settings you may be running anywhere from 1.2 to 1.4 vCore

Download CPU-Z and then check it during load. vCore has many more variables than just the offset option.

 

[malific-end]

 

[malific-end]

This is what my bios says, that i have no offset and core is 1.215, but in my gigabyte info app it says my offset is like +0.29 yet cpuid and other programs never see it above 1.215v also turbo is disabled.

 

[Shneiky]

Download CPU-Z, install it, load the CPU with Prime95 and check the vCore. Bios shows voltage without load. vCore changes with load.

 

[malific-end]

yeah done that, voltage on cpu-z shows 4.5ghz core voltage 1.213v when running prime. core temps around 55-58 other than my high core thats sitting like 4 degrees hotter.
On some parts of the test temps hit 65-70.

 

[Shneiky]

Well, vCore seems ok. What cooler do you use?

 

[malific-end]

phanteks big twin heatsink twin 140mm SP fans, ph-15-ec or something i always forget, I also have 2 front 140mm fans, 2 rear 120mm exhaust fans and a 120mm on the side puting cool air onto the gpu. I was going to try and make an air cooled monster overclock but I have stopped at my current 4.5ghz now giving it 1.23 volts, playing advanced warfare for the last few days im getting fixed 91 fps at all times and core temps of 45 on highest settings, it seems more than comfortable doing what I want to do, I might be downloading witcher 3 soon to really put it through its gaming paces lol.

 

[Shneiky]

With that cooler, your temps sound in line with your vCore. I guess you are all good.